Display screen or portion of a device with transitional graphical user interface



FIG. 1 is a front view of a first image of a display screen or portion of a device with transitional graphical user interface;

FIG. 2 is a front view of a second image thereof;

FIG. 3 is a front view of a third image thereof;

FIG. 4 is a front view of a forth image view thereof;

FIG. 5 is a front view of a fifth image thereof; and,

FIG. 6 is a front view of a sixth image thereof.

The broken line shown in FIGS. 1-6 is included for the purpose of showing a portion of a display screen and forms no part of the claimed design.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1-6. The process or period in which one image transitions to another image forms no part of the claimed deign. 

CLAIM The ornamental design for a display screen or portion of a device with transitional graphical user interface, as shown and described. 